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    <title>焊接电路板学习与实践</title>
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<body>
    <div class="container">
        <header>
            <h1>动手实践：从零开始学习焊接电路板</h1>
            <p class="subtitle">掌握基础焊接技能，完成你的第一块电路板焊接作品</p>
        </header>
        
        <main>
            <section>
                <h2>一、学习焊接电路板</h2>
                
                <h3>1. 认识元件与工具</h3>
                <div class="content">
                    <p>焊接电路板的核心是理解元件特性和工具使用：</p>
                    <ul>
                        <li><strong>关键元件</strong>：电阻、电容（注意电解电容正负极，长脚为正）、三极管（需区分基极/集电极/发射极）、二极管（环标端为负极）</li>
                        <li><strong>必备工具</strong>：内热式电烙铁、无铅焊锡丝、助焊剂、烙铁架、吸锡枪（修正错误必备）</li>
                    </ul>
                </div>
                
                <h3>2. 操作步骤与技巧</h3>
                <div class="content">
                    <p>规范操作是焊接成功的基石：</p>
                    <ol>
                        <li><strong>固定电路板</strong>：小型板使用助焊台/吸盘固定，避免晃动</li>
                        <li><strong>预热与上锡</strong>：先给烙铁头镀锡（保持湿润），再接触焊盘送锡，时长1-2秒</li>
                        <li><strong>元件插装</strong>：先矮后高（电阻→二极管→电容→三极管），插装前核对极性！</li>
                    </ol>
                </div>

            </section>
            
            <section class="product">
                <h2>二、焊接成品展示</h2>
                <div class="content">
                    <p>历经“脚林立”的挑战与反复修正，最终收获这份亲手打造的作品：</p>
                    <div class="img-grid">
                        <div class="img-item">
                            <img src="photos/hanjie1.png" alt="焊接过程1">
                        </div>
                        <div class="img-item">
                            <img src="photos/hanjie2.png" alt="焊接过程2">
                        </div>
                        <div class="img-item">
                            <img src="photos/hanjie3.png" alt="焊接过程3">
                        </div>
                        <div class="img-item">
                            <img src="photos/hanjiezheng.png" alt="最终成品">
                        </div>
                    </div>
                </div>
            </section>
        </main>
        
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            <p>© 2023 电子制作爱好者社区 | 用动手实践点亮科技之路</p>
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